Friendly Jerk

I am an average male nudist and have a circle of female friends that enjoy the similar lifestyle. Friday nights at my apartment are a regular thing. I have one friend in particular that enjoys touching/holding or stroking my penis. We have never had sex and do not intend to but her fascination on jerking me off is fantastic. As we normally watch television in the nude, she cannot help stroking my cock and then walking away for a while. She even goes to the point of cleaning me up after I have ejaculated. Sometimes she does it two to three times an evening thus leaving me with a very sore member for the weekend.